most recent 30 from aviation.stackexchange.com 2025-08-08T00:22:15Z https://aviation.stackexchange.com/feeds/question/106433 https://creativecommons.org/licenses/by-sa/4.0/rdf https://aviation.stackexchange.com/q/106433 3 Jono https://aviation.stackexchange.com/users/31590 2025-08-08T17:02:08Z 2025-08-08T01:49:59Z

<p>For A330, may I know why is the DC BAT BUS supplied for approximate 7 seconds in the BAT only configuration? From the FCOM, during the 7s, the DC BAT is supplied directly by the BAT 1/2 through the BCL charging contactors (6PB1/2, I believe).</p> <p>Some say it is the time for the CSM/G to speed up. But the CSM/G is to mainly supply DC ESS (through the TR ESS). Even after the CSM/G is speed-up, the DC BAT will not be supplied any more, so it's not that important. Also, even during the BAT only config, the BAT 1/2 can supply DC ESS directly, so it's not needed to supply the DC ESS through the DC BAT (by the DC ESS TIME Contactor 4PC).</p> <p>Any people know why is there a 7s momentarily supply? Is it related to some of the equipment connected on DC BAT that it is crutial during the 7s? What makes the DC BAT so important that it is powered only 7 seconds, but not that important after?</p>

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